Dispersive bottleneck delaying thermalization of turbulent bose-einstein condensates.
Dispersive bottleneck delaying thermalization of turbulent bose-einstein condensates.
复制标题
延迟湍流玻色爱因斯坦凝聚热化的色散瓶颈。
DOI：
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发表时间：
2010
影响因子：
8.6
通讯作者：
M. Brachet
中科院分区：
文献类型：
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作者：
G. Krstulovic;M. Brachet
在截断的Gross-Pitaevskii动力学中得到了一种涉及直接能量级联的新的热化机制。在系统达到平衡之前，观察到了一个小尺度的部分热化的长瞬变过程。研究发现，涡旋消失是最终热化的前奏。当截断波数处存在较大的色散效应时，出现了产生自发有效自截断和延迟热化的瓶颈。数量级估计表明，在湍流玻色-爱因斯坦凝聚体中发生了自截断。这种效应在经典流体力学和湍流模型中也应该存在。
A new mechanism of thermalization involving a direct energy cascade is obtained in the truncated Gross-Pitaevskii dynamics. A long transient with partial thermalization at small scales is observed before the system reaches equilibrium. Vortices are found to disappear as a prelude to final thermalization. A bottleneck that produces spontaneous effective self-truncation and delays thermalization is characterized when large dispersive effects are present at the truncation wave number. Order of magnitude estimates indicate that self-truncation takes place in turbulent Bose-Einstein condensates. This effect should also be present in classical hydrodynamics and models of turbulence.